vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/ColumnIterator.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Worksheet;

use Iterator;
use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
use PhpOffice\PhpSpreadsheet\Exception;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;

class ColumnIterator implements Iterator
{
    /**
     * Worksheet to iterate.
     *
     * @var Worksheet
     */
    private $worksheet;

    /**
     * Current iterator position.
     *
     * @var int
     */
    private $currentColumnIndex = 1;

    /**
     * Start position.
     *
     * @var int
     */
    private $startColumnIndex = 1;

    /**
     * End position.
     *
     * @var int
     */
    private $endColumnIndex = 1;

    /**
     * Create a new column iterator.
     *
     * @param Worksheet $worksheet The worksheet to iterate over
     * @param string $startColumn The column address at which to start iterating
     * @param string $endColumn Optionally, the column address at which to stop iterating
     */
    public function __construct(Worksheet $worksheet, $startColumn = 'A', $endColumn = null)
    {
        // Set subject
        $this->worksheet = $worksheet;
        $this->resetEnd($endColumn);
        $this->resetStart($startColumn);
    }

    /**
     * Destructor.
     */
    public function __destruct()
    {
        $this->worksheet = null;